If pronouns of different persons are to be used together in a sentence, the serial order of persons should be as follows;
second person (2) + third (3)+ first person(1) in normal sentences. But when mistake or fault is expressed in the sentence,
the order should be; first person (1) + second person (2) + third person (3). RULE-231
ex : You, he and I have finished the work. (Normal idea)
I, you and he are to blame. (here Confession of guilt is expressed, it’s a negative idea, hence order is 123)